<!DOCTYPE html>
<html lang="zh_CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width,initial-scale=1.0">
  <title>Title</title>
  <style>
    .outer-box{
      z-index: 999;
      position: absolute;
      width: 240px;
      top: 187px;
      left: 239px;
      bottom: 200px;
    }
    .inner-box{
      display: block;
      width: 200px;
      height: 200px;
      background: #00ffd5;
    }
  </style>
</head>
<body>
<div class="outer-box">
  <div class="inner-box"></div>
</div>
</body>
</html>
